8.8

CVE-2026-74955: mozilla firefox Improper Privilege Management

CVSS: 8.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-74955CGA-7c5r-xp85-8mprCGA-f47m-6m8x-cg6c
Published 18-08-2026Last modified 21-08-2026
Open JSON

Vulnerability summary

CVE-2026-74955 is a high (CVSS 8.8) Improper Privilege Management vulnerability in mozilla firefox. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.4% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.19 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 12
MGASA-2026-0345MGASA-2026-0346OPENSUSE-SU-2026:11546-1OPENSUSE-SU-2026:11580-1OPENSUSE-SU-2026:12098-1OPENSUSE-SU-2026:21713-1

Timeline

  1. 18-08-2026
    PublishedVulnerability first disclosed.
  2. 21-08-2026
    Last modifiedVulnerability information updated.

Description

Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.19 pp

From 0.22% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu8 products
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
Chainguard3 products
  • firefox< 154.0-r0
  • firefox-docker-selenium-compat< 154.0-r0
  • firefox-esr-140All versions (No fix recorded)
Mozilla2 products
Wolfi2 products
  • firefox< 154.0-r0
  • firefox-docker-selenium-compat< 154.0-r0

4 vendors · 15 products

References

8 links